Journal
CATALYSIS TODAY
Volume 357, Issue -, Pages 380-391Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.09.027
Keywords
Photocatalysis; TiO2 thin films; Cu-TiO2 films; N-TiO2 films; Visible light active catalysts; Water treatment; Bisphenol A; Batch recycle reactor
Funding
- Slovenian Research Agency [P2-0150]
- Masdar Institute of Science and Technology part of Khalifa University of Science and Technology [SSG2017-000007, SSG2017-000008]
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In this work, TiO2 thin films were deposited onto soda lime glass substrate by two different techniques: sol-gel (SG) and sputtering (SP). The photocatalytic film performance was assessed in a batch recycle reactor testing the photocatalytic degradation of aqueous solutions of bisphenol A (BPA). The use of supported catalysts in batch recycle reactor systems for the photocatalytic degradation of organic pollutants in waste water can be an alternative to nowadays more used slurry batch reactor systems and powdered catalysts, since it is more economically sustainable and not requiring the removal of catalyst particles after waste water treatment. The best photocatalytic activities were achieved with SG films due to their porosity, which allows BPA molecule to better access the catalytic site than in case of SP films. Raman spectroscopy also showed that SP films have more oxygen vacancies, which may end up acting as charge recombination centers. Doping of TiO2 thin films, either with N or Cu, enabled us to trigger the catalytic activity of films also under UV-free visible light radiation. Regardless the order of stacking in the double-layered films, the latter did not result in an increased catalytic activity towards the photodegradation of BPA.
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